Malicious PDF — malware analysis report

Static analysis result for SHA-256 9135b3afff2b82b0…

MALICIOUS

PDF

35.9 KB Created: 2020-11-07 08:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4b04a982117c17a6e4db499d7a9f8365 SHA-1: 2bd5ed19e827d5f37978dd2e6b78bc89bb4cd36c SHA-256: 9135b3afff2b82b0141b3a64ecb3098d68025a81b594de1388785b8720284601
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffmen.ru/aws?keyword=list+of+cincinnati+zip+codes+by+neighborhood In PDF document text
    • https://fijateri.weebly.com/uploads/1/3/4/3/134371572/3898885.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/4687156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5f8efd3623c07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e907f658-26e3-4b4d-b6f5-2f9c4a89c950/taretudiwukala.pdfIn PDF document text
    • https://lukamukiza.files.wordpress.com/2020/11/65572778010.pdfIn PDF document text
    • https://buvuwadozov.files.wordpress.com/2020/11/42969793533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8350561-54ba-4686-9d22-fe760f8e95d3/new_free_trial_chat.pdfIn PDF document text
    • https://tufebofajo.files.wordpress.com/2020/11/86107692793.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/5337457517.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/blank_world_map_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27bbde6f-052e-4f9a-9002-ba24e2dafcc9/signifie_avoir_un_compte_bancaire.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/vewakajojajibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41c1f06-bc59-41c3-b744-66fbdf29ac33/naruto_shippuden_ultimate_ninja_blazing_tier_list.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e924f549-c155-49fe-8022-c445e3cf5fa9/trk_kurtulu_sava_bat_cephesi.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41D8 5408 bytes
SHA-256: 4376e1a92a8408f79bf63906f4734c1ad7a736e9374950b187ed1d636c2e1a72
font_01_sfnt_off00005437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5437 9544 bytes
SHA-256: 67b0ffc8d17c2eeb27bb718224142c38925db4d412e2bc02c24a7ccc3d97d61c
font_02_sfnt_off0000741c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x741C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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